Auxiliary exhaust valve for uniflow steam engines



F 1927. 1,616,667' ,eb 8" F. F. PELTZER n AUXILIARY EXHAUST VALVE FORUNIFLOW STEAM ENGINES Filed Jv-ne s, 1924 2 sheets-Sheen Fig.1

' 1,616,667 Feb 8 1927 IF. F. PELTZER4 AUXILIARY EXHAUST VALVE FORUNIFLOW STEAM ENGINES Filed June 9, 1924 2 Sheets-51166152 J5 l /5Patented Feb.Y Y8,1921, 1 Y

'FRANZ nnitnmann Pnt'rznn,J

Y y AUXILIARY ExAUsrjvALvn nos4 uNrnL-'owfs'rnarr JENGINEsj-fApplication mea :une 9, 1924, serial No. 718,956, ma mser'rnan'yiune 14,igea' It isflnown in unifloW-steamlengines, for thef purpose ofyobviatlng or t reducing the compression, torprovide an `auxiliaryexhaust port` Which'is vcontrolled lby, fthe= pressure in theWorkingjcylinder. YLlior this purpose the auxiliary `exhaust'valveisgenerally con-V -nected to a piston moving 1n a cylinder in' connectionywith the ,interior lof the ,vvorl ing cylinder. lf This auxiliary;vexhaustvalve y is under the action 'of aspring suchthat the-valve opensas soonas the'. pressurein thefworling cylinder falls belowa'predetermined value, andv closes on4 the return of the 4Workingpiston, after vthe piston' has passed the auxiliary exhaust port, underthe pressure of. the initial compression. d

Y ordinary Working conditions, butfailsvvith engines, such aslocomotives,vvhichiare frey quentlystarted and stopped,v Withtheseenlgines it may 'happen that, atfthe moment when the steamrenters theWorhingfcylinder,

j the auxiliaryVVV exhaust valve isstill o en, so

. that-all the Working,steamv escapest rough the valve andtheengineconsequently cannotstart. i. Y v .il

The invention obviate'szthis'drawback by the arrangementby which thepiston' of the auxiliary exhaust valve is exposedto. the

pressure of the Working fluid by an ainiliaryV inlet valve. which openssomewhat earlier.

j than the main inlet valve, so that the auxil-l @pression pressureoftheworking cylinder, yat

' least'in the normalvvorliing, must lbe utilized m orderltoclosejtheauxiliary exhaust valve, is accordingto the invention, betweenv there 1l`the space invwhichr. the pistonof=theauxil` iary exhaust-valvemoveslandlthe Work-,jAA

ing'.gcylinrderc,vr arest'ricted passage orf a throt-tling; device`which, ywhen the auxiliary" inlet'rali'fe is open, 'establishes therequired 4difference of pressure? relative. to',tl1atin th'e'1workingcylmder.-

Threedierent examples of 'constructions' f'raccordingsto the inventionVKare shown lin Figs. 1 to 3, Lland ofthe accompanying drawings, each ofwhich is ya sectional view,

the Workingv "parts being 2 shown indifferent positions.'` Y t' ,y y cReferring to-Figs. 1 to 3,1- 1s thevvorking aliada 2 .the sorties 1rises?? sie man .Y TheY main inletof This knowndevice `is satisfactoryunderA L'The mainand auxiliary nlet vmeans of a pin r'21,-

; the auxiliary lexhaust valve 6 E21);A

i the rnormal vWorkingthe auxiliary -inlet' valve "15 is Vmoreor'lessi-inoperativeland the auxil- I v,

iaryv ,exhaust-valve" 6 fisjzclosed ginknown f exhaust porty oftheWorking 4 an auxiliary exhaust, p ,ort lcommun'ica-tingV Witha ,valvekchamber 5, 1n Which the'faux1lia'ry exhaust valve `fis'arranged. Thevalve v Y' The liftiof the" auxiliary exhaust valve-f is f limited byvanupper bushtwhich' connects with: they main, inlet, chanjneljQ. .Y `Thespace 210 between' the` exhaustl valve andthe bush 8 isrconnectedWiththechannel 9 by a small v.

restricted passage 11,

the `channelQ is controlledyby the' mainainlet'V valve 12 which `isunder the actionofthe vspring 1S and establishes-a direct V communi-Vcation between the I*Working Huid inlet 414;

and lthe channel. 9.-y

' 'With-this main inlet Vvalvefis connected-an auxiliaryfinlet ,valve 15which isloaded ybyf f 'Y i a spring` 16 and, `Whenopen,V allows theWork-f `ingvfluid toy enterfthrough thejhollow 'shaft l 17 of themaininletvalve 12 intol an annular-vf l chamber'lS, whenceitoxvs'fthrough an in# l termediatepassa e19 into the chamberl() of theVauxiliary ex aust!valve,5.r

operated by-means of a rodl 20 wvhiclnlbyV inlet valve- 15. and thenjbyits annular vend valves fare ASD.

firstopens the auxiliary v A 85;` surface 22- opens the main inletv,valvel/lZ-` v f On starting the engine, the auxiliary inlet I. y

valve 15' yis first opened by means; Yof* the rod p20; the lWorkingluifd 'c the'nnflov'vs from the inletl 14 through the hollow shaft 517the chamberr18and the intermediate .passage .so l 'l V119 into thechamber :10V.over-thevauxiliary 1 exhaust valveG and-closes `vthelvalvebyV press-1 ing it down onits seat 23 against ythe action y V'.lhe maininletl valve 12 then' immediatelyopens, so that the vvtnrkingfluidv canlunder no, circumstances yescapl-z through 1 'line openings 2l which'connect the channel t?y with the hollow shaft ,1713211191 @thema ico losY freed thev exhaust port 3, the pressure through the'auxiliary inletvalve 15 and the hand accelerate the equilibrium of pressure between theauxiliary inlet` space and the working cylinder, and on Vthe other handprovide an initial iiow of theworking fluid into the working cylinder.

In Fig 3 there is shown the position ofthe parts, when both .inletvalves are ,.olosed. The exhaust ports 3 are opened by the piston, inthecy'linder and' the spa-ce 10 is under atmospheric pressure, so thatthe spring 7 opens the auxiliary exhaust valve 6. 'In some circumstancesit is preferable to provide'the auxiliary exhaust valve with. twopistons, one of which is vessentially vinfluenced by the pressure in theworking cylinder`,while the other is entirely controlled by the`pressure of the working fluid.`V lt is posible in this lwayto Vobtainthe mo t favourable construction for both means of operating theYauxiliary exhaust valve.

` This construction is shown in Fig. ,4. l The position of the parts inthisfigure corresponds 4to/that shown in Fig. 2. The auxili'aryexhaustvalve 25 is provided with-twopistons 26' and 27 of which the upper ter--minat'esin the main inlet channel 9 andan annular space 28 surrounds thejunctionot the two pistons, the

piston 26 being otlarger cross section than the piston 27, ln thisarrangement as in the preceding, the main inlet valve 12 isoperat'edtogetherwitli the auxiliary inlet valve 15, by a.rod Q0. The

p passage 19 communicates withthe channel 9 through Iarestrictedpassage29. `.The action is thesaine as in the constructionshown in Fig. 1.r During lthe expansion stroke of the engine the workingpressure acts on'tlie piston 27 and' holds the valveV 25 closed. Afterthe piston-'2 at Vthe end of its stroke khas is released frein theworking cylinder 1 and also from the piston 27, and the valve 25 opensunder the action oit its spring 7j In the normal operation ofthe engine,on there- -turn strolreoit the pistonf 'the compression pressure actsonthe cross section of the piston 27 and in known manner closes theValve 'The 'in'iowing working"fluidr entering passage 19 over the piston4.26 plays no. part in the'normal operation of the engine, since inthiscase thefvalvfe Q5 is closed wlienthe auxiliary 'inlet opens.

r 29 'and lt "the engine, Vlf'mwevei',`,1s to besta-rted iti-'oni aposition in whichrthe piston 2 has not yet covered theA i auxiliaryexhaust port-4, as soon as the inlet port is opened,th'exworking fluid,in consequence of the Vprevious opening'of the auxiliary inlet 15,-e-nters intoV the annular space 28' and closes the'valve 25 before theworking Huid is admitted through the main Vin-` let valve ,'12 to. thelcylinder 1. Consequently, thew'oiking fluid cannot escape through theauxiliary exhaust valve.

serve, in this construction, as in The I passagesV the example shown inFig. 1, for equalizing the pressure in the cylinder 1 and the space .Inthe example shown in F ig. the pistons of the` auxiliary exhaust-valveare separate. The piston 32 isconnected with the operated by a' rod.20,.by which', through` the hollow` shaftf17, ythe inlet 14 andthepas-Y sage 19 isconnectedwiththe auxiliaryf'ex-- haust valve., Since in'this case the pistons 32 and 33'have the saine diameter,1 thisconstruction is s-implerand cheaper to manu-v v lf iacture. f

An opening- Begin thegpiston 38' connects `the interior-ot', the pistons32 and with the passage 19. Y Y p l The acti'onfof ythis Aconstructionvisv the same as that shown inA ig. t, with this 'ditference only, that,if on starting-the engine the auxiliary inlet valve lbpensfand theVworking liu-identers betweenth'e pistons 32 and 33,' only the lowerpiston i'spressed downwards, while the upper piston k33 remains initsupper dead position or is'iiorcedv upwards into'this position. j

In the normal working, thelpistons 32 and 33 are not separatechsince onthe compression'strolie they areA moved*=` together down'- wards by thecompression',pressure acting on the upper piston and' later,` after lthepressure has been equalized,v they are moved together upwards vby vaspring 7.

The inventionv is not`"lini'ited tothe described and representedexamples, butfcan be carriedout different ways.

' I claim: Y

1. An engine comprising a working cyl- Y inder, a piston reciprocatingtherein, main and ,auxiliary exhaust ports uncovered yby said piston, aninletport into said cylinder,`

a chamber, and ya-passage connecting said chambery with said auxiliaryexhanstport,

avalve in .said chamber', main and auxiliaryiiilet valves, means ioropening said 'auxilf iary inlet 'valve before saidV main inlet valve,

a restricted passagel connectingsaid inlet port with onejside of saidauxiliary/exhaust@ valve, and a passage:connecting `-the said ,side ofthe auxiliaryexhaust valve with the supplyr ot' working iiuid when said`auxiliary inlet port is opened. y I Y 2. An engine comprising a .workingcylinder, a piston reciprocating thereinjmain and auxiliary exhaustports uncovered by saidV piston.

VaV chamber andy a passage connecting saidV chamber with said auxiliaryexhaust vporta valve in said chamber, aspring pressing y on said valveand adapted to open it, main and auxiliary inlet valves, .means torlopenlnf Self-l m1211112@ :inlet Valve before said all inlet port intosaidcylinder,

main inlet valve, a restricted passage connecting said inlet port With`one side of said auxiliary exhaust Valve, anda passage connectingthe-said side of the auxiliary exhaust valve with the supply of Workingfluid When said auxiliary inlet portvis opened.

3. An'en'gin'e coinprisinga Working cylA e inder, a piston reciprocatingtherein, main n io and auxiliary exhaust ports uncoveredfby said piston,an'iiilet port'nto said cylindeigl a chamber and Va p'assage'connectingsaid chamber with ,said auxiliaryv exhaustport,V

a U-sliaped spring/operated yalye in said chamber, a bush inserted insaid Chamber, a g shoulder. on said bush limitingl the Vstroke of'saidauxiliary exhaust valve,main andy auxiliary Vinlet Valyes, nieansgifor`opening said auxiliary inlety Valve before said main inlet valve, a.restricted passage connecting" said inlet port Withoneside of saidauxil:

iary exhaust valve, and a passageconnecting f thesaid side of theai'ixiliaryexhaust'valvev if with' the supp-ly of Workinguid when saidauxiliary inlet port is opened. f l

a chamber and a passage connecting "said v, 4v. An engine comprising aWorking' cylinder, a'piston" reciprocating.therein, main and auxiliarylexhaust ports un'coyered by said piston, aniiilet portintosaidcylinder,

chamber kwith said auxiliary exhaust port,

a 'UV-shaped, spring operated y.valve in said chamber, abushfopen'l atVone endi'to said Y, inlet 'port and closed at the Yotherend `insertedin said chamberga shoulder on said bush limiting the strole'of saidauxiliary exhaust vYalve, afrestri'ctedy passagelin'the closed end' ofsaid bush, main and auxiliary inlet valvesand means I for opening saidauxiliary inlet valve beforesaid `main inlet valve, and a `passagelconnecting thesaidy side of the auxiliary-exhaust yaliie' With thesupply 'of Workingfiuidwhen said aux* 1 iliary inlety p'orti'is'opened.VY i 5. An engine-comprisingva working cyl-y inder, a pistonreciprocatingtherein, main i and auxiliary exhaust, ports uncovered by said piston,an inletiport into said cylinder, a

chamber and a passage connecting said chamber :with said auxiliaryexhaust port,

a spring Voperated valveAin'saidchan'iber,

main and auxiliary inlet valves, Vmeans-tor opening said'auxiliaryfinlet Valve before vsaidmain inlet valve, lsaidlineaiiscompris ing a tube V integral Withsaid main inlet valve, a valve 'seatforv'said` auxiliaryl inlet Valve in said main inlet valve, a stemattached to said auxiliary inlet Valve disposedv WithinV said tube andmea-ns for first lifting' said valve stem andthensaid tube.

6, VAn engine comp-rising agiworking cyl@` inder, pistonl'reciprocatingtherein, mainand auxiliary .exhaustports .uncovered bysaid piston,,anfinletfport into lsaid cylinder, a chamber and a 'passageVconnefctingv said.,`

chamber `with said auxiliary exhaust port,rv

arspring operated Valvev iny said 'l chamber,

in ain and auxiliaryl inlet valves, means for opening .saidauxiliary'inlet Valy'e before" said main inletw valve, saidine'anscomprising' a tube integral With said mainfinlct valve, jayalye" `seatfor said auxiliary inlet `Valve inrsaid'- mainjinlet valve, a. stein at`Within *saidrv tube, a rod',A a pinl onf said`rod engaging withsaidvalvejstein anda flat 7; An' engine c and auxiliary-exhaustportsuncovered byv said piston, an' 'inlet port-into, said cylinder, achamber andl a passagercon'necting said .chamber With Vsaid auxiliaryexhaust'eport, yaspring operated ifalvefinl said chamber,y flmain yandauxiliary inlet valves, meansy for` -itachedV to said auxiliary inletyValve disposed' i yopening said auxiliary Linlet 'Valvebfeforef saidmain inlet Valve, said means compris-'g ing a tube `integral VWith'saidmain inlet valve, a` Valve seat vfor said auxiliary inlet Valvel in saidmain inlet-,valveyfine openings .in said main inlet valve. connectingsaid inlet port VWith the interior of said tube, a stem attached tovsaid auxiliary inletyalve' disposed 'i .Within [said tube and) Vmeansfor first lifting said Valve stein and then said A'tube-f."- f V Intestimony whereof Iaifixmysignature.

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